Question at position 24 Which of the following is an example of passive transport across cell membranes?Sodium-potassium pumpEndocytosisFacilitated diffusionExocytosis单项选择题
A
Sodium-potassium pump
B
Endocytosis
C
Facilitated diffusion
D
Exocytosis

Question

Question at position 24 Which of the following is an example of passive transport across cell membranes?Sodium-potassium pumpEndocytosisFacilitated diffusionExocytosis

BlackTom AI · Accepted Answer

Consider the concept being tested: identifying a passive transport process across cell membranes.
Option 1: Sodium-potassium pump. This is an active transport mechanism that uses energy from ATP to move Na+ out of the cell and K+ into the cell against their concentration gradients, so it does not fit passive transport.
Option 2: Endocytosis. This process involves engulfing material into the cell via vesicle formation and requires energy, classifying it as active transport rather than passive.
Option 3: Facilitated diffusion. This method relies on specific transport proteins to move molecules down their concentration gradient without the expenditure of cellular energy, which is the hallmark of passive transport.
Option 4: Exocytosis. Like endocytosis, exocytosis involves vesicle fusion with the plasma membrane to expel material and is powered by cellular energy, making it an active transport process.
In summary, among the choices, only facilitated diffusion aligns with passive transport characteristics, while the others require energy or involve vesicular mechanisms that consume energy.

Question at position 24 Which of the following is an example of passive transport across cell membranes?Sodium-potassium pumpEndocytosisFacilitated diffusionExocytosis单项选择题

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